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ANSYS Workbench Fatigue Module

Ansys Fatigue Module 1

 

This tips & tricks article illustrates how to take into account a non-zero mean stress in an ANSYS Workbench fatigue analysis.


 Download: ANSYS Workbench Fatigue Model (*.wbpz)


 

Combine static and varying load in WB Fatigue Module

ANSYS WB Fatigue Module is able to solve Constant Amplitude, Non-Proportional Loading

First here are some definitions:

 Ansys Fatigue Module 2

 

Non zero mean stress loading

To create this fatigue solution we have to obtain the stress result for Smaximum and Sminimum

Ansys Fatigue Module 3

Alternating bending stress   R < -1

 For instance we have an alternating bending stress with a mean compression stress.

 

Ansys Fatigue Module 4

 

Smaximum and Sminimum

In ANSYS Workbench we have to combine the static and alternating stress in 2 static structural solutions that will give us the Smaximum and Sminimum.

Ansys Fatigue Module 5

Ansys Fatigue Module 6

 

 

Solution Combination

 Ansys Fatigue Module 7

Once the maximum and minimum result is obtained we will be able to combine them into a Solution combination to allow the fatigue module calculate it.

 

Ansys Fatigue Module 8

 

 

 ANSYS Workbench Fatigue Module Result

 Ansys Fatigue Module 9

 

In the Gerber mean stress correction theory, the compression mean stress has a penalizing impact on the fatigue life of the part.

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